Abstract
WE have investigated the absorption spectrum of caesium vapour in an electric field by a method similar to that used by C. J. Bakker in Prof. Zeeman's laboratory1 and by E. Amaldi and E. Segre2 in studying potassium and sodium. The background was given by a high purity carbon arc. A Hilger large quartz spectrograph E1 was used. A spar crystal was placed in the light beam before the slit of the spectrograph, so that polarisations parallel to the electric field (-component) and perpendicular to it (-component) could be photographed simultaneously and separately.
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